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20731075 = 521748779
BaseRepresentation
bin100111100010…
…1010011000011
31110000020200121
41033011103003
520301343300
62020201111
7341132311
oct117052303
943006617
1020731075
111077a622
126b39197
1343ab111
142a790b1
151c4781a
hex13c54c3

20731075 has 12 divisors (see below), whose sum is σ = 27219240. Its totient is φ = 15608960.

The previous prime is 20731069. The next prime is 20731091. The reversal of 20731075 is 57013702.

It is not a de Polignac number, because 20731075 - 25 = 20731043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23965 + ... + 24814.

It is an arithmetic number, because the mean of its divisors is an integer number (2268270).

Almost surely, 220731075 is an apocalyptic number.

20731075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20731075 is a deficient number, since it is larger than the sum of its proper divisors (6488165).

20731075 is a wasteful number, since it uses less digits than its factorization.

20731075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48806 (or 48801 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 20731075 is about 4553.1390270889. The cubic root of 20731075 is about 274.7096660367.

Adding to 20731075 its reverse (57013702), we get a palindrome (77744777).

The spelling of 20731075 in words is "twenty million, seven hundred thirty-one thousand, seventy-five".

Divisors: 1 5 17 25 85 425 48779 243895 829243 1219475 4146215 20731075